Subject: General Aptitude · Chapter: Problems on Numbers · Exam: · Marks: · Difficulty:
The sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the two-digit number?
(a)69
(b)78
(c)96
(d)Cannot be determined
(e)None of these
Answer
Answer (as printed): D
Explanation
Let the ten’s digit be x and unit’s digit be y. Then, x + y = 15 and x – y = 3 or y – x = 3. Solving x + y = 15 and x – y = 3, we get : x = 9, y = 6. Solving x + y = 15 and y – x = 3, we get : x = 6, y = 9. So, the number is either 96 or 69. Hence, the number cannot be determined.
Explanation as extracted from the printed page; notation may be imperfect.